XML alias-uri problem

{:deps {org.clojure/data.xml {:mvn/version "0.2.0-alpha6"}}}

Description

This snippet works on a console and is extracted verbatim from the data.xml documentation. But here we have a problem.

If you try to run this cell from a fresh Runtime, you will get an error with the message Invalid token: ::xh/html:

(require '[clojure.data.xml :refer :all])

(alias-uri 'xh "http://www.w3.org/1999/xhtml")

(emit-str {:tag ::xh/html

           :content [{:tag ::xh/head} {:tag ::xh/body :content ["DOCUMENT"]}]})

Explanation

Nextjournal support actually checked this.

This is what they are suspecting is happening:

"I think this is an issue with the context of how cells are run, in that the alias does not affect code within the same cell.  I was able to get it to run by moving the emit-str  to its own cell." - Nextjournal support

So I also tried what they tried (run alias-uri and emit-str in different cells) and it works:

(require '[clojure.data.xml :refer :all])

(alias-uri 'xh "http://www.w3.org/1999/xhtml")

(emit-str {:tag ::xh/html

           :content [{:tag ::xh/head} {:tag ::xh/body :content ["DOCUMENT"]}]})